Answer:
B
Explanation:
Energy at the top of the hill = energy at the bottom of the hill + energy lost
PE = KE + E
mgh = 1/2 mv² + E
(52 kg) (9.8 m/s²) (50.0 m) = 1/2 (52 kg) (25 m/s)² + E
25480 J = 16250 J + E
E = 9230 J
First, we need to fight the weight of the balls instead of their mass. We do this by multiplying their weight it kg by 9.8. This gives us .98 N. To find the potential energy of the rolling ball, we find its kinetic energy. The formula for this is KE=mass*velocity^2*1/2.
Plugging in our numbers, we have Kinetic energy = .1 * 1^2*1/2 which gives us .05 joules.
Now we find the potential energy of the ball on the shelf. For this we do:
Potential energy = .1*9.8*1, and our answer is .98 joules. Clearly, the ball on the shelf has more energy.
Answer:
a. U = 1.68 μJ
b. i = 7.39 mA
Explanation:
a.
The energy total of the circuit can be find using
U = Q ² / 2 * C
Q = 3.56 μC
C = 3.77 μF
U = (3.56 μC ) ² / 2 * 3.77 μF
U = 1.6808 x 10 ⁻⁶ J
U = 1.68 μJ
b.
Now to determine the current in the circuit
U = ¹/₂ * L * i²
i² = 2 * U / L
i = √ 2 * U / L
i = √2 * 1.68 μJ / 61.5 mH
i = 7.39 mA
The lighter one travel with the speed of 0.574 m/sec. Force is defined as the product of mass and acceleration. Its unit is Newton.
<h3>What is force?</h3>
Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body.
The two skaters push off against each other on frictionless ice, then torque act by the one skater on the other is equal.
P₁₂=P₂₁
F₁₂V₁ =F₂₁V₂
625 ×V₁= 725 N× 1.5 m/s
V₁=0.574 m/sec
Hence, the lighter one travel with the speed of 0.574 m/sec.
To learn more about the force, refer to the link;
brainly.com/question/26115859
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